Verb conjugation of "nag" in English

In May I'll be able to show the machine at an exhibition in the university. In addition, we can show it to all these university partner laboratories in the U.S., which are led by people who live here.
I usually do not travel, and if I do, then only to England, when I visit my parents who live in a suburb of London. I can not afford to travel too much, because it is a very large expense.
I have been studying Hungarian for one month. I also speak English, German and Latin. Hungarian would be my fourth language, and it gives me headache. I still can not say anything, not even one word.